abushcandle_2.ino

#include "Interval.h"
#include <Adafruit_NeoPixel.h>

const int knockSensor = A0;
int val = 0;

#define PIN 6
const int numPixels = 7;

Adafruit_NeoPixel strip = Adafruit_NeoPixel(numPixels, PIN, NEO_RGBW + NEO_KHZ800);

int alpha; // Current value of the pixels
int dir = 1; // Direction of the pixels... 1 = getting brighter, 0 = getting dimmer
int flip; // Randomly flip the direction every once in a while
int minAlpha = 25; // Min value of brightness
int maxAlpha = 100; // Max value of brightness
int alphaDelta = 5; // Delta of brightness between times through the loop

void setup() {
  Serial.begin(9600);
  strip.begin();
  strip.show();
}

void loop() {
  val = analogRead(knockSensor);
  Serial.println(val);

  flip = random(40);
  if (flip > val/2) {
    dir = 1 - dir;
  }
  if (dir == 1) {
    alpha += alphaDelta;
  }
  if (dir == 0) {
    alpha -= alphaDelta;
  }
  if (alpha < minAlpha) {
    alpha = minAlpha;
    dir = 1;
  }
  if (alpha > maxAlpha) {
    alpha = maxAlpha;
    dir = 0;
  }

  strip.setPixelColor(0, alpha / 5, alpha * 1.5, 0, 10); // orange
  strip.setPixelColor(1,  alpha / 3, alpha, 0, alpha ); // white
  strip.setPixelColor(4, alpha / 5, 0, 30); // cyan
  strip.setPixelColor(2,  0, 0, 0, 0);
  strip.setPixelColor(3,  0, 0, 0, 0);
  strip.setPixelColor(5, 0, 0, 0, 0);
  strip.setPixelColor(6, 0, 0, 0, 0);
  strip.show();
}